JM Berger argues that in declaring the caliphate, ISIS is demonstrating an appetite for risk. A key quote: 'Above all else, it is clear that ISIS is an adrenaline addict. If the group survives, it may be emboldened to take even greater risks in the future, and our strategy needs to be informed by that understanding.'

Codehesive has produced a powerful infographic illustrating the composition and pacing of Commonwealth deaths during the First World War.